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Income Taxes (Tables)
6 Months Ended
May 31, 2020
Income Tax Disclosure [Abstract]  
Income tax benefit computed at the statutory U.S federal income tax rate and income tax benefit (expense) provided in the consolidated statements of operations Our income tax expense and effective tax rates were as follows (dollars in thousands):
 
Three Months Ended May 31,
 
Six Months Ended May 31,
 
2020
 
2019
 
2020
 
2019
Income tax expense
$
15,800

 
$
9,300

 
$
24,900

 
$
13,800

Effective tax rate
23.3
%
 
16.4
%
 
18.2
%
 
15.1
%